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Ok, we are back. When all said and done NOT counting a 360 mile tank not towing touring Yellowstone, we did 1301.8 miles and used 92.53 gallons for 14.07 mpg average. That is including a 10,900 climb and many other smaller passes where you could no way coast down without lots of engine and traditional braking. Mostly around 60 mph with some sections slower or faster, nothing over 65. The non-towing tank for comparison was 17.3 MPG and the max speed possible in Yellowstone is about 50 mph but mostly 40 with lots of stopping for wildlife.
The best tank was the last with a 275.2 miles at 15.1 MPG losing 3200 feet but also having a large pass in the middle that needed braking on the way down. The indicated on that tank was also 15.1 and before the pass and the 65 mph interstate run it was indicating 16.5 mpg!
Overall I'm happy, I want to still try a belly pan and upgrade my hitch as Slowmover recommended. I'd love to see how well it might do towing it with something that has better economy. The 5.7 Hemi isn't exactly known for getting good mileage.
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